Home › Live Quakes › Boonville M3.7
M3.7 earthquake near Boonville, California (Mendocino County), Sept. 25, 2026
As of Sep 26, 2026, 3:27 PM CT. Observed data only; this page does not forecast earthquakes.
USGS reports a magnitude 3.74 (mw) earthquake 10 km W of Boonville, CA, in Mendocino County, California. USGS event ID nc75442207.
- Magnitude
- M3.74 (mw)
- Location
- 10 km W of Boonville, CA, Mendocino County
- Coordinates
- 39.0145, -123.4773
- Depth
- 4.8 km (3.0 mi)
- UTC
- Sep 26, 2026 3:42 AM UTC
- Pacific
- Sep 25, 2026 8:42 PM PDT
- Central
- Sep 25, 2026 10:42 PM CDT
- Eastern
- Sep 25, 2026 11:42 PM EDT
- Felt reports
- 133 (USGS DYFI), max CDI 4.3
- ShakeMap max
- MMI 4.2
- PAGER alert
- None issued
- Tsunami
- USGS tsunami flag 0
Map
Epicenter: 39.0145°N, 123.4773°W (39.0145, -123.4773). View larger map
Aftershocks
As of Sep 26, 2026, 3:27 PM CT, the USGS catalog lists 2 later M1+ events within 15 km of the epicenter since Sept. 25:
| Mag | Pacific time | Depth (km) | USGS location |
|---|---|---|---|
| M2.74 | Sep 25, 2026 9:02 PM PDT | 3.5 | 10 km W of Boonville, CA |
| M1.83 | Sep 25, 2026 9:15 PM PDT | 1.8 | 10 km W of Boonville, CA |
Source: USGS catalog query.
How far it was felt
USGS "Did You Feel It?" has 133 responses with a maximum community intensity of 4.3. The farthest ZIP-code response was from Milpitas, CA, about 227 km (141 mi) from the hypocenter (intensity 2.0). USGS DYFI.
On the USGS ShakeMap, the MMI III contour reaches about 24 km (15 mi) from the epicenter and the MMI II contour about 41 km (26 mi). Peak ShakeMap intensity is MMI 4.2. USGS ShakeMap.
Regional context
From Sept. 21 through the time checked, USGS lists 16 quakes of M2.5 or larger in California and Nevada, including offshore Northern California. (We searched 31°-42.5° N, 127.5°-108.5° W and dropped the events located in Utah and Wyoming.) The M3.74 Boonville quake is the largest. 4 of them were offshore west of Petrolia near the Mendocino triple junction; the largest of those was M2.96 on Sep 21, 2026 11:54 AM PDT. USGS query.
Sources
- USGS event page nc75442207 and event detail GeoJSON
- USGS Did You Feel It? · USGS ShakeMap
- USGS nearby-events query
More on Ring of Fire
- Live Quakes map (USGS feeds)
- What is an aftershock?
- How earthquake magnitude works
- Earthquake swarms explained
- Alerts and official warning sources
Also on Ring of Fire: M6.6 earthquake in the Loyalty Islands, New Caledonia (Sept. 25, 2026).